Which are the naturally porous things?

natural things means things which are not processed by humans in any way. porous means having holes in it. not only on surface but also inside that object.
for example sea sponge
tell me some names of rocks
or some woods
or anything which is porous
Asked Oct 28, 2017
Many natural substances such as rocks and soil (e.g. aquifers, petroleum reservoirs), zeolites, biological tissues (e.g. bones, wood, cork), and man made materials such as cements and ceramics can be considered as porous media.
Answered Jan 08, 2019

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